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Changing the compression level in GZipMiddleware #730

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Changing the compression level in GZipMiddleware #730

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Adding the ability to change the compression level. By default, pytho…
bronekot Nov 22, 2019
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bronekot Nov 22, 2019
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16 changes: 12 additions & 4 deletions starlette/middleware/gzip.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,29 +6,37 @@


class GZipMiddleware:
def __init__(self, app: ASGIApp, minimum_size: int = 500) -> None:
def __init__(
self, app: ASGIApp, minimum_size: int = 500, compresslevel: int = 9
) -> None:
self.app = app
self.minimum_size = minimum_size
self.compresslevel = compresslevel

async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
if scope["type"] == "http":
headers = Headers(scope=scope)
if "gzip" in headers.get("Accept-Encoding", ""):
responder = GZipResponder(self.app, self.minimum_size)
responder = GZipResponder(
self.app, self.minimum_size, self.compresslevel
)
await responder(scope, receive, send)
return
await self.app(scope, receive, send)


class GZipResponder:
def __init__(self, app: ASGIApp, minimum_size: int) -> None:
def __init__(self, app: ASGIApp, minimum_size: int, compresslevel: int) -> None:
self.app = app
self.minimum_size = minimum_size
self.compresslevel = compresslevel
self.send = unattached_send # type: Send
self.initial_message = {} # type: Message
self.started = False
self.gzip_buffer = io.BytesIO()
self.gzip_file = gzip.GzipFile(mode="wb", fileobj=self.gzip_buffer)
self.gzip_file = gzip.GzipFile(
mode="wb", fileobj=self.gzip_buffer, compresslevel=self.compresslevel
)

async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
self.send = send
Expand Down